Python中的操作符--转载
| Operator | Description | Example |
|---|---|---|
| + | Addition - Adds values on either side of the operator | a + b will give 30 |
| - | Subtraction - Subtracts right hand operand from left hand operand | a - b will give -10 |
| * | Multiplication - Multiplies values on either side of the operator | a * b will give 200 |
| / | Division - Divides left hand operand by right hand operand | b / a will give 2 |
| % | Modulus - Divides left hand operand by right hand operand and returns remainder | b % a will give 0 |
| ** | Exponent - PerfORMs exponential (power) calculation on operators | a**b will give 10 to the power 20 |
| // | Floor Division - The division of operands where the result is the quotient in which the digits after the decimal point are removed. | 9//2 is equal to 4 and 9.0//2.0 is equal to 4.0 |
| == | Checks if the value of two operands are equal or not, if yes then condition becomes true. | (a == b) is not true. |
| != | Checks if the value of two operands are equal or not, if values are not equal then condition becomes true. | (a != b) is true. |
| <> | Checks if the value of two operands are equal or not, if values are not equal then condition becomes true. | (a <> b) is true. This is similar to != operator. |
| > | Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. | (a > b) is not true. |
| < | Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. | (a < b) is true. |
| >= | Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. | (a >= b) is not true. |
| <= | Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. | (a <= b) is true. |
| = | Simple assignment operator, Assigns values from right side operands to left side operand | c = a + b will assigne value of a + b into c |
| += | Add AND assignment operator, It adds right operand to the left operand and assign the result to left operand | c += a is equivalent to c = c + a |
| -= | Subtract AND assignment operator, It subtracts right operand from the left operand and assign the result to left operand | c -= a is equivalent to c = c - a |
| *= | Multiply AND assignment operator, It multiplies right operand with the left operand and assign the result to left operand | c *= a is equivalent to c = c * a |
| /= | Divide AND assignment operator, It divides left operand with the right operand and assign the result to left operand | c /= a is equivalent to c = c / a |
| %= | Modulus AND assignment operator, It takes modulus using two operands and assign the result to left operand | c %= a is equivalent to c = c % a |
| **= | Exponent AND assignment operator, Performs exponential (power) calculation on operators and assign value to the left operand | c **= a is equivalent to c = c ** a |
| //= | Floor Dividion and assigns a value, Performs floor division on operators and assign value to the left operand | c //= a is equivalent to c = c // a |
| & | Binary AND Operator copies a bit to the result if it exists in both operands. | (a & b) will give 12 which is 0000 1100 |
| | | Binary OR Operator copies a bit if it exists in eather operand. | (a | b) will give 61 which is 0011 1101 |
| ^ | Binary XOR Operator copies the bit if it is set in one operand but not both. | (a ^ b) will give 49 which is 0011 0001 |
| ~ | Binary Ones Complement Operator is unary and has the efect of 'flipping' bits. | (~a ) will give -60 which is 1100 0011 |
| << | Binary Left Shift Operator. The left operands value is moved left by the number of bits specified by the right operand. | a << 2 will give 240 which is 1111 0000 |
| >> | Binary Right Shift Operator. The left operands value is moved right by the number of bits specified by the right operand. | a >> 2 will give 15 which is 0000 1111 |
| and | Called Logical AND operator. If both the operands are true then then condition becomes true. | (a and b) is true. |
| or | Called Logical OR Operator. If any of the two operands are non zero then then condition becomes true. | (a or b) is true. |
| not | Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. | not(a && b) is false. |
| in | Evaluates to true if it finds a variable in the specified sequence and false otherwise. | x in y, here in results in a 1 if x is a member of sequence y. |
| not in | Evaluates to true if it finds a variable in the specified sequence and false otherwise. | x not in y, here not in results in a 1 if x is a member of sequence y. |
| is | Evaluates to true if the variables on either side of the operator point to the same object and false otherwise. | x is y, here is results in 1 if id(x) equals id(y). |
| is not | Evaluates to false if the variables on either side of the operator point to the same object and true otherwise. | x is not y, here is not results in 1 if id(x) is not equal to id(y). |
The following table lists all operators from highest precedence to lowest.
| Operator | Description |
|---|---|
| ** | Exponentiation (raise to the power) |
| ~ + - | Ccomplement, unary plus and minus (method names for the last two are +@ and -@) |
| * / % // | Multiply, divide, modulo and floor division |
| + - | Addition and subtraction |
| >> << | Right and left bitwise shift |
| & | Bitwise 'AND' |
| ^ | | Bitwise exclusive `OR' and regular `OR' |
| <= < > >= | Comparison operators |
| <> == != | Equality operators |
| = %= /= //= -= += |= &= >>= <<= *= **= | Assignment operators |
| is is not | Identity operators |
| in not in | Membership operators |
| note or and | Logical operators |
相关文章